When comparing Portal 2 vs Factorio, the Slant community recommends Factorio for most people. In the question“What are the best low-spec PC games?” Factorio is ranked 9th while Portal 2 is ranked 50th. The most important reason people chose Factorio is:
With proper planning, users can "code" together very precise ways to create all the things needed for the game, some in very inventive ways that can differ quite a bit. This allows for tons of replayability.
Specs
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Pros
Pro Co-op does not punish when you want to goof off with or troll the other player
While Portal 2 requires focus and logic, it does not punish players for causing a bit of mischief. The instant respawn system means trolling your friend will affect almost nothing in the game, as there are no in-game setbacks when you die. Being able to stop at any point in the game to just goof around is great for releasing some steam, even when it is at the expense of your co-op partner.
Pro Huge selection of user-generated content that should appeal to any use-case
The game has more than 60,000 co-op puzzles created by users through the Steam Workshop and through mods. Because it is user-generated content, the quality and size of these puzzles vary widely, including everything from simple, one-off chambers to full-fledged expansions with high-quality stories, voice-overs, and new gameplay elements (for example, Mel). By having such a selection of content, there should be something that appeals to just about anything someone is looking for.
Pro Entertaining and well delivered voice acting
Voice acting for Wheatley the AI robot is done by Stephen Merchant (Extras, The Office UK, Life's Too Short) in humorous fashion. His delivery is well executed on all dialogue. On top of this specific experience, the rest of the voice acting of every other character in the game is performed just as well, in part due to the fact that the dialogue was written in a funny smart and entertaining cool fashion. This makes for a top quality listening experience that shows a lot of care was taken with the acting of the game.
Pro Creates a sense of accomplishment through a high level of teamwork
Game is shit
Pro Challenging puzzles that require creative thinking
Pro Witty and funny character driven story
Four major characters drive the single player poop campaign, and they are amazing. Three of which have explosive personalities, bring humor, suspense, sadness, and empathy. The other being Chell, who doesn’t speak but her interactions with the rest of the cast make her all the more mysterious and interesting. Most of the time you don’t even see or directly interact with the characters, but that just shows how great and cool they are.
Pro Cross-platform co-op
As long as both players have a Steam account, the co-op is able to be played even if one user is playing on the PS3 while the other is on a PC.
Pro Well implemented tools that improve teamwork
Pro So large in scope that it takes multiple playthroughs to see everything
Portal 2 is larger in every way when compared to the first title, from the longer and more detailed story to the larger levels and new game mechanics. This makes for a title that will last 8-9 hours minimum, with many elements that are worth revisiting, not to mention the co-op section of the game, which is separate from the single player story.
Pro Versatile selection of co-op multiplayer
It’s possible to play a multiplayer game for free online using the Steam servers, as well as locally on your machine using split-screen (the second player must use a gamepad controller if playing locally). This keeps the multiplayer options versatile to any players needs.
Pro Endless solutions
With proper planning, users can "code" together very precise ways to create all the things needed for the game, some in very inventive ways that can differ quite a bit. This allows for tons of replayability.
Pro Under active development
The game is still in Alpha which means endless future possibilities.
Pro Massive and infinite procedurally generated world
The playing world is as large as you want to explore, it automatically generates it as you explore more areas.
Pro Cooperative or PvP building
Factorio also supports multiplayer, allowing many players to cooperate and assist each other, or work against each other in PvP. By default, multiplayer games run the CO-OP freeplay scenario where all players work together to launch a rocket with a satellite into space.
Pro Charming old school graphics
While not the most technically advanced graphics the look of the game is much like a game from the 90s but seeing it in action when an assembly line starts moving there is an impressiveness to it that suits the game quite well.
Cons
Con Main co-op campaign is short
The co-op campaign in Portal 2 is about 4 hours long for experienced players, meaning it could be beaten in a just a couple days. With almost zero replayability, this makes the game feel incredibly short. Luckily, hundreds of hours of user-generated content is available.
Con It's already on every coop list since 2011
Con Steep co-op learning curve
Although the single-player campaign features a gradual learning curve, co-op offers no mercy. The puzzles start off hard and only get harder. It’s highly recommended that you play through single-player first if you are not familiar with Portal's mechanics.
Con Sense of accomplishment is often onesided
Con Frequent motion sickness trigger
Con Late game single player can be quite difficult
While the single player learning curve is quite gradual, late game the puzzles can become quite difficult, sometimes leading to the player being stuck for long stretches of time. While not impossible to solve, some creative thinking will need to be done in order to finish.
Con Can become rather repetitive
There's really little payoff for being able to build really long chains of automation, it usually results in being able to open a new tech tree which allows the player to continue the process of building automation chains ad infinitum, which, admittedly can become rather boring after a while.
Con Still in Early Access
The game is still in Early Access which means there will be bugs as well as missing features.